plugins - wp_ajax action responds with 0

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I'm writing a plugin. There is a button, that triggers an ajax-request to an action I added in my plugin page:

Head of my plugin PHP file:

add_action('wp_ajax_update_nav_items', 'update_nav_items' );
add_action('wp_ajax_nopriv_update_nav_items', 'update_nav_items' );

wp_enqueue_script( 'addItemToNav', plugin_dir_url( __FILE__ ) . 'js/navFunctions.js', array( 'jquery', 'json2' ) );
wp_localize_script( 'addItemToNav', 'menuItems', array(
    // URL to wp-admin/admin-ajax.php to process the request
    'ajaxurl'          => admin_url( 'admin-ajax.php' ),
    // generate a nonce with a unique ID "myajax-post-comment-nonce"
    'postCommentNonce' => wp_create_nonce( 'update_nav_items-nonce' ),
    'action' => 'update_nav_items'
    )
);
function update_nav_items() { 
    // Testing stuff 
    $response = json_encode( array( 'response' => 'success', 'html' => 'some value' ) );
    ob_clean();
    print_r( $response );
    echo json_encode( $response );

    die();
}

My JavaScript which triggers:

var data = {
    action: 'update_nav_items',
    postCommentNonce : menuItems.postCommentNonce,
    menuitems: JSON.stringify(itemtest)
};

jQuery.ajax({ 
    url: menuItems.ajaxurl, 
    data: data,  
    type: 'post',
    dataType: 'json',
    success: function( response ) {
        console.log(response);
    }
}); 

In the browser console, the request is sent to the correct url, including following parameters:

action  update_nav_items
menuitems   {"glossary":{"title":"example glossary","GlossDiv":{"title":"S","GlossList":{"GlossEntry":{"ID":"SGML","SortAs":"SGML","GlossTerm":"Standard Generalized Markup Language","Acronym":"SGML","Abbrev":"ISO 8879:1986","GlossDef":{"para":"A meta-markup language, used to create markup languages such as DocBook.","GlossSeeAlso":["GML","XML"]},"GlossSee":"markup"}}}}}
postCommentNonce    0cee7325b3

(menuitems is just for testing with correct JSON)

What I get as response is 0, so there seems to be a problem with the action. I just don't find it. I already tried adding actions also in my functions.php, it's still not working.

Anyone have a clue?

I'm writing a plugin. There is a button, that triggers an ajax-request to an action I added in my plugin page:

Head of my plugin PHP file:

add_action('wp_ajax_update_nav_items', 'update_nav_items' );
add_action('wp_ajax_nopriv_update_nav_items', 'update_nav_items' );

wp_enqueue_script( 'addItemToNav', plugin_dir_url( __FILE__ ) . 'js/navFunctions.js', array( 'jquery', 'json2' ) );
wp_localize_script( 'addItemToNav', 'menuItems', array(
    // URL to wp-admin/admin-ajax.php to process the request
    'ajaxurl'          => admin_url( 'admin-ajax.php' ),
    // generate a nonce with a unique ID "myajax-post-comment-nonce"
    'postCommentNonce' => wp_create_nonce( 'update_nav_items-nonce' ),
    'action' => 'update_nav_items'
    )
);
function update_nav_items() { 
    // Testing stuff 
    $response = json_encode( array( 'response' => 'success', 'html' => 'some value' ) );
    ob_clean();
    print_r( $response );
    echo json_encode( $response );

    die();
}

My JavaScript which triggers:

var data = {
    action: 'update_nav_items',
    postCommentNonce : menuItems.postCommentNonce,
    menuitems: JSON.stringify(itemtest)
};

jQuery.ajax({ 
    url: menuItems.ajaxurl, 
    data: data,  
    type: 'post',
    dataType: 'json',
    success: function( response ) {
        console.log(response);
    }
}); 

In the browser console, the request is sent to the correct url, including following parameters:

action  update_nav_items
menuitems   {"glossary":{"title":"example glossary","GlossDiv":{"title":"S","GlossList":{"GlossEntry":{"ID":"SGML","SortAs":"SGML","GlossTerm":"Standard Generalized Markup Language","Acronym":"SGML","Abbrev":"ISO 8879:1986","GlossDef":{"para":"A meta-markup language, used to create markup languages such as DocBook.","GlossSeeAlso":["GML","XML"]},"GlossSee":"markup"}}}}}
postCommentNonce    0cee7325b3

(menuitems is just for testing with correct JSON)

What I get as response is 0, so there seems to be a problem with the action. I just don't find it. I already tried adding actions also in my functions.php, it's still not working.

Anyone have a clue?

• plugins
• ajax
• actions

Share Improve this question asked Sep 23, 2014 at 9:57 HyqueHyque 10133 bronze badges 1

• Do you have other plugins activated or a theme other than a default twenty* theme? In this case I would edit the admin-ajax.php file directly, placing some var_dump()s to determine where the script exits. E.g. it would be helpful to know, whether admin_init get called or not. – David Commented Sep 23, 2014 at 10:14

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3 Answers 3

Sorted by: Reset to default 1

Change your wp_localize_script-Call to the right Action:

wp_localize_script( 'addItemToNav', 'menuItems', array(
    // URL to wp-admin/admin-ajax.php to process the request
    'ajaxurl'          => admin_url( 'admin-ajax.php' ),
    // generate a nonce with a unique ID "myajax-post-comment-nonce"
    'postCommentNonce' => wp_create_nonce( 'update_nav_items-nonce' ),
    'action' => 'wp_ajax_update_nav_items'
    )
);

As 'action' you currently Input the function Name, but that is wrong. Your registered Action to call the function has an different Name.

Your AJAX Requests requires an JSON to be returned. But I think your function doesn't return valid JSON.

Haven't tested it, but this function should work:

function update_nav_items() { 
    // Testing stuff 
    $response = json_encode( array( 'response' => 'success', 'html' => 'some value' ) ); // first JSON encode
    ob_clean();

    die(json_encode( $response )); // second JSON encode
}

For testing it, you can call the URL manually and have a look on the returned string, whether it's valid JSON or not.

Regards, lippoliv

Please follow the code:

add_action( 'wp_ajax_add_myfunc', 'prefix_ajax_add_myfunc' );
add_action( 'wp_ajax_nopriv_add_myfunc', 'prefix_ajax_add_myfunc' );

function prefix_ajax_add_myfunc() {
    // Handle request then generate response using WP_Ajax_Response
}

and in your ajax call do this:

jQuery.post(
    ajaxurl, 
    {
        'action': 'add_myfunc',
        'data':   'foobarid'
    }, 
    function(response){
        alert('The server responded: ' + response);
    }
);

in the ajax call you'll call your function without prefix_ajax_. Only call by it's remaining. In that case it's add_myfunc. In the response it will send done if everything goes right. Else response will be 0 or -1.

Hope it will help. Thank you.

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